Java by API/java.lang/Process

Process: exitValue()

   <source lang="java">

/*

* Output:
* 

notepad returned 0

* 
*  
*/

public class MainClass {

 public static void main(String args[]) {
 Runtime r = Runtime.getRuntime();
 Process p = null;
 String cmd[] = { "notepad", "/java/src/java/lang/Runtime.java" };
 try {
     p = r.exec(cmd);
     p.waitFor();
 } catch (Exception e) {
     System.out.println("error executing " + cmd[0]);
 }
 System.out.println(cmd[0] + " returned " + p.exitValue());
 }

}

 </source>
   
  
 
  

Process: getInputStream()

   <source lang="java">

import java.io.BufferedReader; import java.io.InputStreamReader; /*

*/

public class MainClass {

 public static void main(String[] args) throws Exception{
   Runtime r = Runtime.getRuntime();
   String[] nargs = { "sh", "-c", "for i in 1 2 3; do echo $i; done" };
   Process p = r.exec(nargs);
   BufferedReader is = new BufferedReader(new InputStreamReader(p.getInputStream()));
   String line;
   while ((line = is.readLine()) != null)
     System.out.println(line);
 }

}

 </source>
   
  
 
  

Process: getOutputStream()

   <source lang="java">
 

import java.io.OutputStream; public class Main {

 public static void main(String[] argv) throws Exception {
   String command = "cat";
   Process child = Runtime.getRuntime().exec(command);
   OutputStream out = child.getOutputStream();
   out.write("some text".getBytes());
   out.close();
 }

}

 </source>
   
  
 
  

Process: waitFor()

   <source lang="java">

/*

* Output:
* 

notepad returned 0

* 
*  
*/

public class MainClass {

 public static void main(String args[]) {
 Runtime r = Runtime.getRuntime();
 Process p = null;
 String cmd[] = { "notepad", "/java/src/java/lang/Runtime.java" };
 try {
     p = r.exec(cmd);
     p.waitFor();
 } catch (Exception e) {
     System.out.println("error executing " + cmd[0]);
 }
 System.out.println(cmd[0] + " returned " + p.exitValue());
 }

}

 </source>